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diff --git a/inftheory.tex b/inftheory.tex
index e64fe5b..263a0b0 100644
--- a/inftheory.tex
+++ b/inftheory.tex
@@ -80,7 +80,7 @@ It has a simple analytical form:
  H(p) = - \sum_k p(k) \log_2 p(k)
 \]
 %
-where by convention $o \log_2 0 = 0$.
+where by convention $0 \log_2 0 = 0$.
 
 It is often seen as a measure of randomness since the more
 deterministic the distribution is, the less you have to emit.